With the rapid development of the cross-border e-commerce, the corresponding cross-border payment shows a multi-channel, multi-mode and high-frequency nature. The practice of the cross-border e-commerce payment sees several risks from time to time, such as, in credit, interest rate, exchange rate and law. However, these "cross - border" payment risks have not been paid adequate attention in the academic literature, in particular, without in-depth researches on these risk formation mechanisms. With the help of the credit risk theory, combined with the analysis of the specific situations, the relationships and the practices of the cross-border e-commerce payment, this paper systematically discusses various formation mechanisms of the credit risk of the cross-border e-commerce payment, and outlines a three-dimensional picture of the occurrence logic of the cross-border e-commerce payment credit risk.